SoFi Number
A SoFi (Social Fiscal) number is a 9 digit number used in the Netherlands,
which is protected by a special numerical check.
Each digit is multiplied by a factor ranging from 9 to 1.
The calculation results are then summed together (the last result is substracted, rather than added).
Finally, to be a valid SoFi number, the sum must be divisible by 11.
Example (SoFi number: 8765.45.678):
| 8 |
|
7 |
|
6 |
|
5 |
. |
4 |
|
5 |
. |
6 |
|
7 |
|
8 |
| * |
* |
* |
* |
|
* |
* |
|
* |
* |
* |
| 9 |
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
| = |
= |
= |
= |
= |
= |
= |
= |
= |
| 72 |
+ |
56 |
+ |
42 |
+ |
30 |
+ |
20 |
+ |
20 |
+ |
|
18 |
+ |
14 |
- |
8 |
= |
264 |
= |
N*11 |
Example (SoFi number: 3737.37.373):
| 3 |
|
7 |
|
3 |
|
7 |
. |
3 |
|
7 |
. |
3 |
|
7 |
|
3 |
| * |
* |
* |
* |
|
* |
* |
|
* |
* |
* |
| 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 |
| = |
= |
= |
= |
= |
= |
= |
= |
= |
| 27 |
+ |
56 |
+ |
21 |
+ |
42 |
+ |
15 |
+ |
28 |
+ |
9 |
+ |
14 |
- |
3 |
= |
209 |
= |
N*11 |
1998-02-26